Lagascalia 281 18(2), 1996 Although there are substantial phytochemical differences reported (RASMUSSEN & al., 1 9 8 1 ; CHRISTENSEN & al., 1 9 8 4 ; SMITT & CHRISTENSEN, 1 9 9 1 ; SMITT & al., 1 9 9 5 ; JÄGER & a l . , 1 9 9 5 ) , morphological differences are m u c h l e s s d r a m a t i c . Thapsia transtagana u s u a l l y h a s l e a v e s d i s t i n c t l y hairy, especially on the petiole and nerves and the lobes are broader 3 - 1 0 ( - 1 5 ) m m ( a s c o m p a r e d w i t h 1-5 in T. garganica). There are also t w o resin canals a s s o c i a t e d with e a c h v a s c u l a r b u n d l e , o n e o n t h e o u t e r a n d a n o t h e r o n t h e i n n e r s i d e (T. garganica has only the outer resin canals). R e c e n t l y , a n o t h e r s p e c i e s h a s b e e n d e s c r i b e d , T. gymnesica by PUJADAS & al. ( 1 9 9 1 ) , b u t this is r e s t r i c t e d t o s m a l l p o p u l a t i o n s in t h e B a l e a r i c I s l a n d s a n d a p p e a r s t o b e i n t e r m e d i a t e b e t w e e n T. villosa a n d T. garganica. REFERENCES BROTERO, F.A. (1804) Flora Lusitanica. Olisipone. CHRISTENSEN, S.B., E. N O R U P , U. R A S M U S S E N & J . 0 . M A D S E N (1984) Structure of histamine releasing guaianolides from Thapsia 1663. GARCÍA MARTÍN, F. (1987) Thapsia species. Phytochemistry 2 3 : 1659- L . in B. V A L D É S , S. TALAVERA & E. FERNÁNDEZ- GALIANO (eds). Flora vascular de Andalucía Occidental 2 : 327-329. Ketres Edito­ ra S.A., Barcelona. LAGASCA, M . (1816) Genera et Species Plantarum. Matriti, ex Typographia Regia. L A N G E , J. (1880) Fam. 9 6 . Umbelliferae J u s s . in M. W I L L K O M M & J. L A N G E (eds.) Prodromus Flora Hispánica 3 : 1-101. Stuttgart. PUJADAS, A., J.A. ROSELLÓ & P. BARCELÓ (1991) De flora baleárica adnotationes (10). Thapsia gymnesica Spec. nov. Candollea 4 6 : 65-74. RASMUSSEN, U., S.B. CHRISTENSEN & F. SANDBERG (1981) Phytochemistry of the genus Thapsia. Planta Medica 4 3 : 336-341. SMITT, U . W . & S.B. CHRISTENSEN (1991) Nortrilobolid, a new potent guaianolide secretagogue from Thapsia garganica. Planta Medica 5 7 : 196-197. , J Ä G E R , A. K, A. A D S E R S E N & L . G U D I K S E N ( 1 9 9 5 ) C o m p a r a t i v e s t u d i e s in phytochemistry and fruit anatomy of Thapsia garganica and T. transtagana, Apiaceae (Umbelliferae). Bot. J. Linn. Soc. 1 1 7 : 281-292. TUTIN, T . G . (1968). Thapsia L . in T . G . Tutin et al. (eds) Flora Europaea, 2 : 370. Cambridge University Press, Cambridge.